John Sappington

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Sex differences in math/spatial performance demand explanations. Within the biological view, the complexity and number of variables make the explanation difficult at best. Laterality and age of pubertal onset have been investigated prominently in this context but rarely considered as interactions in the same study. Some 468 college subjects with SAT MATH(More)
An archival study sampled personality test protocols with spontaneous handwriting specimens from 73 men and 168 women for signatures and scores on selected scales from the Minnesota Multiphasic Personality Inventory-2. Judges applied a 5-point scale to sort signatures for tidiness. Interrater agreement was .93. The mean handwriting tidiness score for men(More)
Scales of the Minnesota Multiphasic Personality Inventory-2 were correlated to identify which measures predicted depression among 219 women and 115 men. Despite prevalence data indicating that dysphoria is more common among females than males, sex did not predict MMPI-2 Depression scores in this sample. Masculine Gender Role was negatively predictive of(More)
Anomalous cerebral dominance can have multiple manifestations, e.g., left-eye preference or left-foot preference in the absence of left handedness per se. The 1987 estimate of prevalence of anomalous dominance in the population by Geschwind and Behan approaches 30%, three times the estimate obtained by using handedness alone as the sorting criterion.(More)
Separate bodies of research suggest that performance in spatial reasoning covaries with gender and with gender role. Typically studies employ a spatial task whose variance is then used to account for differences in scores between gender groups or variance in a measure of gender role. A methodological issue in such research is that the tasks used to(More)
Interpreting gestures from retarded, nonvocal subjects is scientifically risky. Investigators must construe the subject's meaning without reference to an external validity measure. A procedure was devised in which message content was provided to nonvocal, severely palsied quadriplegic subjects in advance. Subjects' responses were limited to yes/no gestures.(More)
The lateral eye movements of a moderately mentally retarded adult with exceptional ability in a perpetual calendar task were examined. Questions with a perpetual calendar, mathematical, or musical and spatial content were presented to the subject in a random order and lateral eye movements were rated by blind observers. Results showed that both the(More)
The perceptual behavior of process and reactive schizophrenics under neutral and stress conditions suggests an hypothesis that the former employ a repressive ego defensive mode in these conditions while reactives employ a sensitization mode. The Repression-Sensitization scale of the MMPI was administered to a sample of hospitalized process and reactive(More)
The concept of cerebral dominance has attracted recent attention as a dimension in human cognition and psychopathology. Questions have been raised about the validity of the construct and the adequacy of instruments commonly used to assess it. The present study measured the test-retest reliabilities and interrelationships of four commonly used behavioral(More)